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Inhomogeneity of Microstructure and Damping Capacity of a FC25 Disc-Brake Rotor and Their Interrelationship

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Abstract

The objective of the present study was to investigate the inhomogeneity of microstructure and damping capacity of a FC25 disc-brake rotor made of gray cast iron (GCI) and their interrelationship. The rotor had inhomogeneous microstructure due to different cooling rates caused by the position of inlets in a mold during casting. The volume fraction and size of graphite decreased with increasing cooling rate. A maximum deviation of the volume fraction of graphite within the rotor was approximately 2 pct, whereas that of the total perimeter of graphite per unit area was approximately 33 pct. Damping capacities measured at the first vibrational mode of both the real rotor and cantilever specimens, which were taken from four different regions within the rotor, depended on the location within the rotor. This result indicates that the damping capacity of the rotor is influenced by the inhomogeneous microstructure; particularly, the damping capacity was proportional to the total perimeter of graphite per unit area. Therefore, it was concluded that the damping of the GCI rotor used in the present study occurs primarily by the viscous or plastic flow at the interphase boundaries between the pearlite matrix and graphite particles at least at the frequencies of below 1140 Hz.

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Author notes

  1. Jeongho Han (Postdoctoral Research Associate)

    Present address: Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Düsseldorf, 40237, Germany

Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Republic of Korea

    Jongbin Park (Graduate student), Jeongho Han (Postdoctoral Research Associate), Seung-Joon Lee (Postdoctoral Research Associate) & Young-Kook Lee (Professor)

  2. Chassis Design 2 Team, Seohan Industry, Hwaseong, Gyeonggi-do, 445-170, Republic of Korea

    Kyoungdon Yi (Researcher) & Chelwoong Kwon (Researcher)

Authors
  1. Jongbin Park
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  2. Jeongho Han
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  3. Seung-Joon Lee
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  4. Kyoungdon Yi
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Correspondence to Young-Kook Lee.

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Manuscript submitted October 10, 2015.

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Park, J., Han, J., Lee, SJ. et al. Inhomogeneity of Microstructure and Damping Capacity of a FC25 Disc-Brake Rotor and Their Interrelationship. Metall Mater Trans A 47, 3933–3942 (2016). https://doi.org/10.1007/s11661-016-3580-x

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